Terahertz Synthetic Aperture-based Spatiotemporal Imaging

Overview & Synopsis

Terahertz (THz) microscopy has garnered significant attention due to the unique properties of THz radiation, making it appealing for chemical sensing, biomedical diagnostics, and imaging of complex media applications. However, conventional THz imaging systems encounter fundamental resolution limitations due to the Rayleigh diffraction limit. To overcome this challenge, we propose an innovative theoretical and numerical framework by adopting Fourier synthetic aperture principles in the THz spectral range. Our approach synthesizes high spatial frequency components by illuminating the sample with broadband THz pulses from multiple angles and capturing the time-resolved scattered fields through state-of-the-art timedomain spectroscopy (TDS). Our method offers a field-sensitive and experimentally viable solution for surpassing the diffraction limit in THz imaging. It paves the way for high-resolution, labelfree material characterization and noninvasive imaging across various domains, including materials science, biomedical imaging, and security screening.